Drupal 6: Sending an email from a module using drupal_mail

Here's a code snippet that shows you how to use the drupal_mail function to send an email. First define a callback function that will handle the creation of the message. NOTE: this function must end with "_mail"

<?phpfunctionMYMODULE_mail($key,&$message,$params){switch($key){case'invitation':// note: data can be passed to this function in the $params array$message['subject']=t('EMAIL SUBJECT');$message['body']=t('MESSAGE BODY');break;}}?>

Now we can use this callback function in our code:

<?php$params=array('myVar'=>'data you would like in your message and/or subject',);drupal_mail('MYMODULE','invitation',$emailTo,language_default(),$params);?>

More information about drupal_mail can be found here. NOTE: if you're going to send an email to a registered user, you should use the data found in $user for the language and email address.